Rock drill



ROCK DRILL Filed Oct. 1, 1929 2 Sheets-Sheet l Q x I "1 Q NE 39, a 5g K I I A w I) N g m =5 a. Invenwr: E 22726) G. Carl-in.

May 21, 1935.

E. G; GARTIN ROCK DRILL Filed Oct. 1, 1929 2 Sheets-Sheet 2 122067280): 27726! 6. Garz'n.

Patented May 21, 1935 ROCK DRILL Elmer G. Gartin, Claremona'N. assignor to Sull1van-Machinery Company, a corporation of Massachusetts Application October 1, 1929, Serial No. 396,560

10 Claims.

This invention relates to rock drills, and more particularly, but'not exclusively,-relates to improved feeding mechanism for a rock drill of the mounted drifter type.

An object of this invention is to provide an improved rock drill feeding mechanism. Another object is to provide an improved and very ski compact rock drill feeding mechanism of the.

pressure fluid actuated type. Yet another oblo; ject is to provide an improved pressure fluid operated feeding mechanism for such a drill wherein a relatively long feed is obtained without materially increasing the over-all length of the drill. A further object. is to provide in such proved connections between the drilling tool and the movable feeding element whereby the feeding range of the feeding motor is substantially doubled without materially increasing the overall length of the drill. A further object is to provide an improved pressure fluid actuated feeding mechanism for a rock drill wherein a pressure fluid actuated feeding motor is utilized and including cable and pulley connections between the drilling tool and the feeding motor whereby without increasing the over-all length of the feeding motor a relatively long feed is obtained. A still further object is to provide an improved rock drill feeding mechanism including a guide shell on which the drilling tool is slidably guided and improved a'nd'exceedingly compact pressure fluid operated mechanism for positively feedingthe drilling tool forward and rearward relative to the guide shell. These and other ob- Ijects and advantages of this invention will, however, hereinafter more fully appear. 7

In the accompanying drawings there is shown for purposes of illustration one form which th invention may assume in practice.

- In these drawings,--

1 Fig. l'is a side elevational view of a rock drill having incorporated therein the illustrative embodiment of the improved feeding mechanism. Fig. 2'is a transverse vertical sectional view taken substantially on'line 2-2 of Fig. 4.

Fig. 3 is'a transverse vertical sectional view taken substantiallyon line 3-3 of Fig. 4.

4 is a central, longitudinally extending, vertical developed sectional view taken through the improved feeding mechanism, the drillin tool being shown in side elevation.

-Fig.-5is a transverse vertical sectional-view taken on line 5-5 of Fig. 4. v

' Fig; 6 a detail "sectional view of' the valve a drill a pressure fluid actuated feeding motor of the cylinder and piston type including immechanism shown in Fig. 4, the valve being shown in its reverse position.

. In this illustrative construction I have shown a rock drill of the mounted drifter type including a hammer type drilling tool I of a standard 0011- 5 struction including a drill steel 2 adapted to be percussively actuated by a usual hammer motor 3. As is usual in drilling tools of the drifter type the cylinder of the hammer motor 3 has formed integral therewith lateral guide members or gibs 4 (see Fig. 2) which are slidably mounted within parallel guideways 5 formed ona guide shell 6. This guide shell has a usual swivel base or plate 1 adapted to be mounted within a usual trunnion mounting on a tripod or column in a well known manner. As clearly shown in Figs. 1 and 2, secured by parallel longitudinally extending side members or rods 8 to the rear end of the guide shell .5 is a transverse head or block 9, this member 9 being spaced longitudinally from the guide shell bymeans of spacing sleeves l 0 encircling the side rods 8. Arranged within a transverse conical bore I I formed in the head member 9 is the conical end of a feed piston rod 12, this conical end of the piston rod being rigidly secured within the bore in the member 9 by means of a nut l3 threadedly connected at M to the rear end of the piston rod. Rigidly secured by a threaded connectionlfi to the forward end of the piston rod '12 is a feed piston i6 arranged within a bore i'l formed in a feed cylinder I8. As shown in Fig. 4, this feed cylinder extends longitudinally of the guide shell 6 and is slidably supported withinthe guide shell. The feed cylinder is provided withfront and rear cylinder heads i9 and 20, the rear cylinder head 28 having a central bore 2| through which the piston rod 12 extends. A usual cuppacking 22 carried by the rear cylinder head engages the external periphery of the feed piston rod to prevent leakage of pressure fluid from the cylinder bore. Surrounding the piston rod and slidably mounted thereon is an adjustable support 24 abutting at its forward end against the rear cylinder head. The support 24 is provided with a stub shaft 26 on which is journaled a pulley or sheave 27, the latter being held in position on the shaft'by means of a screwand washer connection 28. The front cylinder head is is provided with a forward cylindrieal extension 29 having mounted thereon an away at 33 throughout a substantial portion of its length to provide clearance for the pulleys 27 and 32 as hereinafter described. Passing around the pulleys 2i and 32 is an endless flexible element, herein a cable 34. The cable 34 is secured at 35 by an adjustable clamping bolt 36 to a projecting portion 3'! formed on the rear head 38 of the hammer motor 3 of the drilling tool. This cable is also attached by a clamping bolt 39 (see Fig. 3) to the guide shell 6. The cable 3 t maintains the pulleys in the position shown although it is evident that if desired the pulley supports 24 andSfl may be held in a suitable manner against rotative movement relative to the supports on which they are mounted. s

The improved mechanism for controlling the fluid distribution means for the feed cylinder herein includes a rotary throttle valve 4E! arranged within a transverse bore 4i formed in the head member 9 to which the piston rod of the stationary feed piston' i2 is secured. This valve has a usual operating handle 42. Formed in the head member 9 are parallel passages 43 and t4 communicating with the bore ti and with parallel passages 45 and 36 respectively formed in the piston rod 82. The passage 45 extends throughout the length of the piston rod l2 and communicates at its forward end with the front end of the feed cylinder bore at the front side of the feed piston, while the passage it communicates through a lateral port it with the rear end of the feed cylinder bore at the rear side of the feed piston. The valve tit has formed therein a radial port 38 communicating with the central supply passage 58 within the valve. Also formed on the exterior periphery of the valve are-exhaust grooves 55 and 52 which are communicable with exhaust ports 53 and 54 formed in the valve casing. Pressure fluid is supplied to the pressure chamber 58 in the throttle valve through a flexible hose connection 55 which is connected to the pressure chamber within a throttle valve 55 which controls the supply of pressure fluid to the hammer motor 3. This hose connection 55 is of such length as to permit the drilling tool tobe fed into its extreme forward position relative to the guide shell. When the valve is in the position shown in Fig. 4, pressure fluid is admitted from the central supply chamberbil in the valve through the port at, passage 43 in the member 9, and passage 45 in the piston rod to the feed cylinder bore at the-front end of the feed piston. At the same time the feed cylinder bore at the rear side of the feed piston is connected to exhaust through port ll, passage 45 in the feed piston rod, passage 46 in the member 9, the exhaust groove 52 in the valve and exhaust port 54. As a result, the feed cylinder I8 is fed forward relative to the guide shell 6, moving therewith the pulleys 21 and 32. As the feed cylinder is and the pulleys 21 and 32 move forward, the cable 34 due to its connection at 39 to the guide shell and to the drilling tool causes the latter to be fed forward along the guideways on the shell at a feeding speed substantially twice the rate of travel of the feed cylinder, the pulleys and cables forming a connection between the feed cylinder and the drilling tool which materially increases the feed. Whenthe throttle valve 40 is turned'into its opposite position as shown in Fig. 6, the feed cylinder bore at the front side of the feed piston'is exhausted to atmosphere, while the rear end of the feed cylinder bore is connected to, the pressure fluid supply and as a result the feed cylinder is fed rearward relative to the stationary feed piston.

In the operation of the improved rock drill feeding mechanism the guide shell 6 is set up adjacent the working face with its swivel support I mounted within the usual trunnion mounting of a tripod or column. When the parts are in the position shown in Fig. 1 with the feed cylinder and drilling tool in their rearmost position, the pressure fluid is admitted to the cylinder bore at the front side of the feed piston and as a result the feed cylinder is fed forward relative to the guide shell 6. As the feed cylinder moves forward the pulleys 27 and 32 move therewithand'these pulleys together with their cooperating cable t i, which is attached to the guide shell and the drilling tool, cause the latter to be fed forward at a feeding speed substantially twice the rate of movement of said cylinder. When the hole is completed or if it is desired to change steels, the throttle valve 40 is turned into its reverse position and the feed cylinder bore at the front side of the piston is vented to atmosphere, while pressurefluid is admitted to the cylinder bore at the rear side of the piston. As a result the feed cylinder and drillingtool are fed rearward relative tothe guide shell to the position shown in Fig. 1.

As a result of this invention an improved rock drill feeding mechanism is provided wherein a relatively long feed is obtained without materially increasing the over-all length of the drill. It will further be noted that by providing the reciprocable feed cylinder and a stationary feed piston arranged in the manner disclosed herein and by employing a cable and pulley connection between the reciprocable feed cylinder and the drilling tool, the feeding speed of the tool is substantially increased, the feeding movement of the drilling tool being substantially twice that of the feed cylinder. These and other uses and advantages of the improved feeding mechanism will be clearly apparent to those skilled in the art.

While I have in this application specifically described one form which my invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a rock drill, a guide shell, a drilling tool guided thereon, and feeding mechanism for the drilling tool including a reciprocable cylinder and a piston element and a connection between said reciprocable cylinder element :and the drilling tool whereby the feeding speed of the latter is substantially multiplied.

2. In a rock drill, a guide shell, a drilling tool guided thereon, and feeding mechanism for the drilling tool including a reciprocable cylinder and a piston element and a cable and pulley connection between said reciprocable cylinder element and the drilling tool whereby the feeding speed of the latter is substantially multiplied.

3. In arock drill, a guide shell, a drilling tool guided thereon, and feeding mechanism for the drilling tool including relatively reciprocable cylinder and piston elements, said cylinder element being guided by said shell, and speed multiplying connections between said cylinder element and said drilling tool.

4. In a rock drill, a guide shell, a drilling too] guided thereon, and feeding mechanism for the drilling tool including relatively reciprocable cylinder and piston elements, said cylinder element being guided by said shell, and speed multiplying connections between said cylinder element and said drilling tool including a cable and pulley connection.

5. In a rock drill, a guide shell, a drilling tool guided thereon, and feeding mechanism for the drilling tool including relatively reciprocable cylinder and piston elements, said cylinder element being guided by said shell, and speed multiplying connections between said cylinder element and said drilling tool including a pulley carried by said cylinder and a cooperating cable attached to the drilling tool.

6. In a rock drill, a guide shell, a drilling tool guided thereon, and feeding mechanism for the drilling tool including relatively reciprocable cylinder and piston elements, said cylinder element being guided by said shell, and speed multiplying connections between said cylinder element and said drilling tool including a pulley carriedby said cylinder and a cooperating cable attached to the drilling tool and said guide shell.

7. In a rock drill, a guide shell, a drilling tool guided 'thereon, and feeding mechanism for the drilling tool including relatively recipro'cable cylinder and piston elements, said cylinder element being guided by said shell, and speed multiplying connections between said cylinder element and said drilling tool including pulleys moving with said cylinder and a cooperating cable attached to the drilling tool.

8. In a rock drill, a guide shell, a drilling tool guided thereon, and feeding mechanism for the drilling tool including piston and cylinder elements one of which is movable, a pulley mounted on the front end of themovable, one of said elements, a flexible portion secured at one of its ends to said shell and passing forwardly from such point of connection around said pulley and then rearwardly, means for attaching the rearwardly extending strand of said flexible portion to the rear end of said drilling tool thereby to effect a multiplied forward feed of the drilling tool, and means for feeding the drilling tool rearwardly with a multiplied effect including a pulley carried by the rear end of said movable element, and a flexible portion secured to the rear end of the drilling tool and passing rearwardly over said latter pulley and thence forwardly to a point where it is secured to the front end of said shell.

9. In a rock drilling mechanism, a guide shell, a rock drill slidably guided thereon, and pressure fluid actuated mechanism for feeding the rock drill relative to said guide shell including relatively reciprocable cylinder and piston elements, said piston element remaining stationary during reciprocation of said feed cylinder, and connections between said reciprocable feed cylinder element and the rock drill whereby upon movement of the cylinder at a certain speed the rock drill is fed at a substantiallyhigher speed, said connections including guide pulleys, one mounted at each end of said feed cylinder element, flexible feeding means guided by said pulleys and extending therebetween and including flexible feeding portions arranged parallel and adjacent to the feed cylinder, and means for connecting said flexible feeding portions to said guide shell and rock drill.

10. In a rock drilling mechanism, a guide shell, a rock drill slidably guided thereon, and pressure fluid actuated mechanism for feeding the rock drill relative to said guide shell including relatively reciprocable cylinder and piston elements, said piston element remaining stationary during reciprocation of said feed cylinder, and connections between said reciprocable feed cylinder element and the rock drill whereby upon movement of the cylinder at a certain speed the rock drill is fed at a substantially higher speed, said connections including guide pulleys, one mounted at each end of said feed cylinder element, endless flexible feeding means guided by said pulleys and extending therebetween, said flexible feeding means having parallel portions arranged parallel with .ELMER, G. GARTIN. 

